N-substituted 3-amino-1, 2, 4-benzotriazine-1-oxides



United States Patent Ofiice 3,079,390 Patented Feb. 26, 1953 This invention relates to N-Substituted 3-amino-1,2,4- benzotriazine-l-oxides in which the 3-substituent is the residue of a primary or secondary amine. Typical amines which may be utilized are ,B-phenylethylamine; furfurylamine; hexamethyleneimine; 1,2,3,4-tetrahydroisoquinoline; fi-methyl-B-hydroxypropylamine; morpholine; fi-hydroxyethylamine; piperidine; ,B-methyl-B-aminou,'y-propanediol; thiosemicarbazide; ketopiperazine; and N-methylglucamine.

The compounds of the present invention are obtained by condensing 3-chloro-1,2,4-benzotriazine-l-oxide with the appropriate primary or secondary amine and isolating the product. For example, treating 3-chloro-1,2,4- benzotriazine-l-oxide with thiosemicarbazide and isolating the product affords 3-thiosemicarbazido-1,2,4-benzotriazine-l-oxide.

The compounds of the present invention possess valuable pharmacological properties. Especially, the subject compositions are distinguished by an exceptional inhibitory effect on the heat, swelling, redness, and granuloma formation characteristic of the inflammatory response to tissue injury.

The invention will appear more fully from the examples which follow. These examples are set forth by way of illustration only and it will be understood that the invention is not to be construed as-limited in spirit or in scope by the details contained therein as many modifications in materials and methods will be apparent in this disclosure to those skilled in the art. In these examples temperatures are given in degrees centigrade C.). Quantities of materials are given in parts by weight unless otherwise noted.

EXAMPLE 1 3-(fl-Phenyletlzylamino) ,2 ,4-benztriazine-1 -0xide A solution of 1 part of 3-chloro-1,2,4-benzotriazine-loxide and 1.9 parts of fi-phenylethylamine in 50 parts of n-butanol is heated at reflux for 2 hours. The crystals obtained by cooling the reaction mixture are recrystallized from ethanol to yield 3-(B-phenylethylamino)-1,2,4- benzotriazine-l-oxide, M.P. about 193195.

EXAMPLE 2 3-Furfurylamino-1,2,4-benz0triazine-1 -axide A solution of 1.5 parts of 3-chloro-1,2,4-benzotriazinel-oxide and 3 parts of furfurylamine in 55 parts of nbutanol is heated at reflux for 2 hours. The mixture is evaporated to dryness in vacuo and the residue dissolved in a mixture of chloroform and water. After separation of the layers, the aqueous solution is extracted with chloroform and the organic layers combined. The chloroform solution is washed with water then dried over anhydrous sodium sulfate and evaporated to dryness in vacuo. Recrystallization of the residue from methanol yields 3- furfurylamino-1,2,4-benzotriazine 1 oxide, M.P. about 172-178".

EXAMPLE 3 3-H examethyleneimino-I ,2,4-benz0triazine-] -oxide A solution of 1 part of 3-chloro 1,2,4-benzotriazine-loxide and 1.7 parts of hexamethyleneimine in 40 parts of n-butanol is heated at reflux for 2 hours. The s0lution is evaporated to dryness in vacuo and the residue dissolved in a mixture of chloroform and water. The water layer is extracted again with chloroform and the organic extracts combined. The chloroform solution is washed with water, dried over anhydrous sodium sulfate, evaporated to dryness invacuo and the residue recrystallized from hexane to afford 3-hexamethyleneimino-1,2,4- benzotriazine-l-oxide, M.P. about 121- 1225".

EXAMPLE 4 3-(1',2',3,4-Tetrahydr0isoquinolino)-1,2,4- benzotriazine-l -0xide To a suspension of 2 parts of 3-chloro-1,2,4-benzotriazine-l-oxide in 100 parts of n-butanol is added 5 parts of 1,2,3,4-tetrahydroisoquinoline and the mixture heated at reflux for 3 /2 hours. The solution is evaporated to dryness in vacuo and the residue dissolved in a mixture of chloroform and water. The aqueous layer is further extracted with chloroform and the extracts combined and washed with water. Drying of the combined extracts over anhydrous sodium sulfate followed by evaporation of the solvent in vacuo results in a residue which is recrystallized from ethanol producing 3-(l',2',3',4'-tetrahydroisoquinolino) 1,2,4 benzotriazine 1 oxide, M.P. about 125-126.

EXAMPLE 5 A solution of 2 parts of 3-chloro-1,2,4-benzotriazine-1- oxide and 5 parts of B-methyl-fi-hydroxypropylamine in parts of n-butanol is heated at reflux for 2 hours. The volatile material is distilled in vacuo and the residue taken up in chloroform and water. The aqueous layer is further extracted with chloroform and the combined chloroform extracts washed with water; then dried over anhydrous sodium sulfate. Evaporation of the solvent in vacuo leaves a residue which is recrystallized from benzene to afford 3-( 8-methyl-/3-hydroxypropylamin0)- 1,2,4-benzotriazine-l-oxide, M.P. about 159-160".

EXAMPLE 6 3-M0rpholino-I,2,4-benz0triazine-1-oxide A solution of 1 part of 3-chloro-1,2,4-benzotriazine-1- oxide and 5 parts of morpholine in 35 parts of n-butanol is heated at reflux for 2 hours. The reaction mixture is concentrated in vacuo to a small volume, then chloroform and water added. The aqueous layer is separated and extracted again with chloroform. The combined chloroform extracts are washed with water, dried over anhydrous sodium sulfate, and evaporated to dryness in vacuo yielding a residue which is recrystallized from methanol to produce 3-.morpholino-1,2,4-benzotriazine-1- oxide, M.P. about 174-176".

EXAMPLE 7 .i-(p-Hydroxyethylamino) ,2,4-benz0triazine-1 -0xide To a suspension of 2 parts of 3-chloro-1,2,4-benzotriazine-l-oxide in 100 parts of n-butanol is added 2 parts of B-hydroxyethylamine and the mixture heated at reflux for 3 /2 hours. The mixture is then evaporated to dryness in vacuo and the residue recrystallized from ethanol to yield 3-(B-hydroxyethylamino)-1,2,4-benzotriazine-1- oxide, M.P. about 114-116.

EXAMPLE 8 3-Piperidine-I,2,4-benz0triazine-1-0xide A solution of 1 part of 3-chloro-1,2,4-benzotriazine-1- oxide and 1.7 parts of p-iperidine in 40 parts of n-but-anol is heated at reflux for 2 hours. The solution is evaporated to dryness in vacuo and the residue dissolved in a 3 mixture of chloroform and water. The aqueous layer is separated and extracted with chloroform and the extracts combined'and washed with water. The chloroform solution is dried over anhydrous sodium sulfate and evaporated to dryness in vacuo leaving an oily residue which is crystallized from hexane to produce 3-piperidino- 1,2,4benzotriazine-l-oxide, M.P. about 108-110".

EXAMPLE 9 3- (a,a-Bishydroxymetlzyl) ethylamino] -1,2,4-

, b nzotriazine-l-oxide A solution of 2 parts of 3-chloro-1,2,4-benzotriazine-loxide and 5 parts of fi-amiuo-fi-methyl-a,y-proptmediol in 100'parts of n-butanol is heated at reflux for 2 hours. Chloroform and water are added to the residue obtained after distillation of the solvent in vacuo. The layers are separated and the aqueous layer is extracted with chloroforms. The combined extracts are washed with water, dried over anhydrous sodium sulfate, and evaporated to dryness in vacuo. The oily residue is chromatographed on 75 parts of silica gel and the product isolated by elution with a 35% ethyl acetate-65% benzene (v./v.) solution. Recrystallization of the crude product from ethyl acetate afiords 3 uebishydroxymethyl)ethylamino]-1,2,4-benzotriazine-l-oxide, M.P. about 127-128".

EXAMPLE 10 3-Thiosemicwrbazido-1,2,4-benz0triazine-1-0xide A mixture of 1 part of 3-chloro-1,2,4-benzotriazine-1- oxide and 1 part of thiosemicarbazide in 40 parts of nbutanol is heated at reflux for 2 hours. Cooling of the reaction mixture results in crystallization of the product which is then collected by filtration and recrystallized from aqueous dime-thylformamide to yield 3-thiosemicarbazido-1,2,4-benzotriazine-1 oxide, M.P. about 253- 255 (dec.).

EXAMPLE 11 3- (3'-Ket0piperazirz0) -1,2,4-benztriHzine-1-0xide A solution of 7 parts of 3-chloro-1,2,4-benzotriazine-loxide and parts of ketopiperazine in 160 parts of n butanol is heated at reflux for 3 hours. The mixture is evaporated to dryness in vacuo and the residue dissolved in chloroform and water. The layers are separated and the aqueous layer extracted with chloroform. The combined extracts are washed with water, dried over anhydrous sodium sulfate, and evaporated to dryness in vacuo. Crystallization oi the residue from either ethanol or hexane produces 3-(3r-ketopiperazino)-1,2,4-benzotriaziue-l-oxide, M.P. about 254-257.

EXAMPLE 12 3-(N-Methylglucamin0) -1,2,4-benzotriazirze-I-oxide A suspension of 2 parts of 3-chloro-l,2,4-benzotriazinel-oxide and 5 parts of N-methylglucamine in 100 parts of n-butanol is heated at reflux for 2 hours. The solution is evaporated to dryness in vacuo and the residue chromatographed on 110 parts of silica gel. Elution with acetone followedby crystallization from a small volume of methanol yields 3-(N-methylglucamino)-1,2,4- benzotriazine-l-oxide, M.P. about 135-137".

What I claim is:

1. 3-Furfurylamino-1,2,4-benzotriazine-1-oxide of the formula 4 2. 3-(l',2',3',4-tetrahydroisoquinolino) 1,2,4 benzotriazine-l-oxide of the formula 3. 3-[(a,u-bishydroxymethyl)ethylamino] 1,2,4 benzotriazine-l-oxide of the formula 4. 3-thiosemicarbazido-1,2,4-benzotriazine 1 oxide of the formula 5. 3-(3'-ketopiperazino)-1,2,4-benzotriazine-1-oxide of the formula 6. 3-(N-methylglucamino) 1,2,4 benzotriazine-l-oxide of the formula CH5 OH I ACHnOH N NCH: CE

References Cited in the file of this patent UNITED STATES PATENTS 2,489,355 Wolf et al. Nov. 29, 1949 2,496,364 Wolf et al Feb. 7, 1950 2,650,919 Cusic Sept. 1, 1953 2,676,971 Cusic et al. Apr. 27, 1954 2,911,406 Mueller Nov. 3, 1959 2,928,767 Gulesich et a1 Mar. 15, 1960 2,966,487 Jiu et a1. Dec. 27, 1960 OTHER REFERENCES Arndt et al.: Deutsche Chemische Gesellshaft (Berichte), vol. 50 (II), pp. 1251 to 1252 and 1259 1917).

Chem. Abs, vol. 42, cols. 4963 to 4964 (1948).

Wolf et al.: J. Am. Chem. Soc., vol. 76, pp. 3551 to 3553, 4611 to 4613 (1954).

Robbins et al.: Journ. of the Chem. Soc., 1957, pp. 3186 to 3194. 

1. 3-FURFURYLAMINO-1,2,4-BENZOTRIAZINE-1-OXIDE OF THE FORMULA 